| 1 | ␉/*␊ |
| 2 | * Copyright (c) 2009-2010 Evan Lojewski. All rights reserved.␊ |
| 3 | *␊ |
| 4 | */␊ |
| 5 | ␊ |
| 6 | #include "libsaio.h"␊ |
| 7 | #include "kernel_patcher.h"␊ |
| 8 | #include "platform.h"␊ |
| 9 | #include "modules.h"␊ |
| 10 | extern PlatformInfo_t* Platform;␊ |
| 11 | ␊ |
| 12 | patchRoutine_t* patches = NULL;␊ |
| 13 | kernSymbols_t* kernelSymbols = NULL;␊ |
| 14 | ␊ |
| 15 | ␊ |
| 16 | void KernelPatcher_start()␊ |
| 17 | {␊ |
| 18 | ␉register_kernel_patch(patch_cpuid_set_info_all, KERNEL_ANY, CPUID_MODEL_UNKNOWN); ␊ |
| 19 | ␊ |
| 20 | ␉register_kernel_patch(patch_commpage_stuff_routine, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 21 | ␉␊ |
| 22 | ␉register_kernel_patch(patch_lapic_init, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 23 | ␊ |
| 24 | ␉// NOTE: following is currently 32bit only␊ |
| 25 | ␉register_kernel_patch(patch_lapic_configure, KERNEL_32, CPUID_MODEL_ANY);␊ |
| 26 | ␊ |
| 27 | ␉␊ |
| 28 | ␉register_kernel_symbol(KERNEL_ANY, "_panic");␊ |
| 29 | ␉register_kernel_symbol(KERNEL_ANY, "_cpuid_set_info");␊ |
| 30 | ␉register_kernel_symbol(KERNEL_ANY, "_pmCPUExitHaltToOff");␊ |
| 31 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_init");␊ |
| 32 | ␉register_kernel_symbol(KERNEL_ANY, "_commpage_stuff_routine");␊ |
| 33 | ␊ |
| 34 | ␉// lapic_configure symbols␊ |
| 35 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_configure");␊ |
| 36 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_start");␊ |
| 37 | ␉register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt_base");␊ |
| 38 | ␉␊ |
| 39 | ␉// lapic_interrup symbols␊ |
| 40 | ␉//register_kernel_patch(patch_lapic_interrupt, KERNEL_ANY, CPUID_MODEL_ANY);␊ |
| 41 | ␉//register_kernel_symbol(KERNEL_ANY, "_lapic_interrupt");␊ |
| 42 | ␊ |
| 43 | ␊ |
| 44 | ␉␊ |
| 45 | ␉// TODO: register needed symbols␊ |
| 46 | ␉␊ |
| 47 | ␉␊ |
| 48 | ␉register_hook_callback("ExecKernel", &patch_kernel); ␊ |
| 49 | }␊ |
| 50 | ␊ |
| 51 | /*␊ |
| 52 | * Register a kerenl patch␊ |
| 53 | */␊ |
| 54 | void register_kernel_patch(void* patch, int arch, int cpus)␊ |
| 55 | {␊ |
| 56 | ␉// TODO: only insert valid patches based on current cpuid and architecture␊ |
| 57 | ␉// AKA, don't at 64bit patches if it's a 32bit only machine␊ |
| 58 | ␉patchRoutine_t* entry;␊ |
| 59 | ␉␊ |
| 60 | ␉// TODO: verify Platform->CPU.Model is populated this early in bootup␊ |
| 61 | ␉// Check to ensure that the patch is valid on this machine␊ |
| 62 | ␉// If it is not, exit early form this function␊ |
| 63 | ␉if(cpus != Platform->CPU.Model)␊ |
| 64 | ␉{␊ |
| 65 | ␉␉if(cpus != CPUID_MODEL_ANY)␊ |
| 66 | ␉␉{␊ |
| 67 | ␉␉␉if(cpus == CPUID_MODEL_UNKNOWN)␊ |
| 68 | ␉␉␉{␊ |
| 69 | ␉␉␉␉switch(Platform->CPU.Model)␊ |
| 70 | ␉␉␉␉{␊ |
| 71 | ␉␉␉␉␉case 13:␊ |
| 72 | ␉␉␉␉␉case CPUID_MODEL_YONAH:␊ |
| 73 | ␉␉␉␉␉case CPUID_MODEL_MEROM:␊ |
| 74 | ␉␉␉␉␉case CPUID_MODEL_PENRYN:␊ |
| 75 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM:␊ |
| 76 | ␉␉␉␉␉case CPUID_MODEL_FIELDS:␊ |
| 77 | ␉␉␉␉␉case CPUID_MODEL_DALES:␊ |
| 78 | ␉␉␉␉␉case CPUID_MODEL_NEHALEM_EX:␊ |
| 79 | ␉␉␉␉␉␉// Known cpu's we don't want to add the patch␊ |
| 80 | ␉␉␉␉␉␉return;␊ |
| 81 | ␉␉␉␉␉␉break;␊ |
| 82 | ␊ |
| 83 | ␉␉␉␉␉default:␊ |
| 84 | ␉␉␉␉␉␉// CPU not in supported list, so we are going to add␊ |
| 85 | ␉␉␉␉␉␉// The patch will be applied␊ |
| 86 | ␉␉␉␉␉␉break;␊ |
| 87 | ␉␉␉␉␉␉␊ |
| 88 | ␉␉␉␉}␊ |
| 89 | ␉␉␉}␊ |
| 90 | ␉␉␉else␊ |
| 91 | ␉␉␉{␊ |
| 92 | ␉␉␉␉// Invalid cpuid for current cpu. Ignoring patch␊ |
| 93 | ␉␉␉␉return;␊ |
| 94 | ␉␉␉}␊ |
| 95 | ␊ |
| 96 | ␉␉}␊ |
| 97 | ␉}␊ |
| 98 | ␉␉␊ |
| 99 | ␉if(patches == NULL)␊ |
| 100 | ␉{␊ |
| 101 | ␉␉patches = entry = malloc(sizeof(patchRoutine_t));␊ |
| 102 | ␉}␊ |
| 103 | ␉else␊ |
| 104 | ␉{␊ |
| 105 | ␉␉entry = patches;␊ |
| 106 | ␉␉while(entry->next)␊ |
| 107 | ␉␉{␊ |
| 108 | ␉␉␉entry = entry->next;␊ |
| 109 | ␉␉}␊ |
| 110 | ␉␉␊ |
| 111 | ␉␉entry->next = malloc(sizeof(patchRoutine_t));␊ |
| 112 | ␉␉entry = entry->next;␊ |
| 113 | ␉}␊ |
| 114 | ␉␊ |
| 115 | ␉entry->next = NULL;␊ |
| 116 | ␉entry->patchRoutine = patch;␊ |
| 117 | ␉entry->validArchs = arch;␊ |
| 118 | ␉entry->validCpu = cpus;␊ |
| 119 | }␊ |
| 120 | ␊ |
| 121 | void register_kernel_symbol(int kernelType, const char* name)␊ |
| 122 | {␊ |
| 123 | ␉if(kernelSymbols == NULL)␊ |
| 124 | ␉{␊ |
| 125 | ␉␉kernelSymbols = malloc(sizeof(kernSymbols_t));␊ |
| 126 | ␉␉kernelSymbols->next = NULL;␊ |
| 127 | ␉␉kernelSymbols->symbol = (char*)name;␊ |
| 128 | ␉␉kernelSymbols->addr = 0;␊ |
| 129 | ␉}␊ |
| 130 | ␉else {␊ |
| 131 | ␉␉kernSymbols_t *symbol = kernelSymbols;␊ |
| 132 | ␉␉while(symbol->next != NULL)␊ |
| 133 | ␉␉{␊ |
| 134 | ␉␉␉symbol = symbol->next;␊ |
| 135 | ␉␉}␊ |
| 136 | ␉␉␊ |
| 137 | ␉␉symbol->next = malloc(sizeof(kernSymbols_t));␊ |
| 138 | ␉␉symbol = symbol->next;␊ |
| 139 | ␊ |
| 140 | ␉␉symbol->next = NULL;␊ |
| 141 | ␉␉symbol->symbol = (char*)name;␊ |
| 142 | ␉␉symbol->addr = 0;␊ |
| 143 | ␉}␊ |
| 144 | }␊ |
| 145 | ␊ |
| 146 | kernSymbols_t* lookup_kernel_symbol(const char* name)␊ |
| 147 | {␊ |
| 148 | ␉kernSymbols_t *symbol = kernelSymbols;␊ |
| 149 | ␊ |
| 150 | ␉while(symbol && strcmp(symbol->symbol, name) !=0)␊ |
| 151 | ␉{␊ |
| 152 | ␉␉symbol = symbol->next;␊ |
| 153 | ␉}␊ |
| 154 | ␉␊ |
| 155 | ␉if(!symbol)␊ |
| 156 | ␉{␊ |
| 157 | ␉␉return NULL;␊ |
| 158 | ␉}␊ |
| 159 | ␉else␊ |
| 160 | ␉{␊ |
| 161 | ␉␉return symbol;␊ |
| 162 | ␉}␊ |
| 163 | ␊ |
| 164 | }␊ |
| 165 | ␊ |
| 166 | void patch_kernel(void* kernelData, void* arg2, void* arg3, void *arg4)␊ |
| 167 | {␊ |
| 168 | ␉patchRoutine_t* entry = patches;␊ |
| 169 | ␊ |
| 170 | ␉␊ |
| 171 | ␉int arch = determineKernelArchitecture(kernelData);␊ |
| 172 | ␊ |
| 173 | ␉locate_symbols(kernelData);␊ |
| 174 | ␉␊ |
| 175 | ␉if(patches != NULL)␊ |
| 176 | ␉{␊ |
| 177 | ␉␉while(entry)␊ |
| 178 | ␉␉{␊ |
| 179 | ␉␉␉if(entry->validArchs == KERNEL_ANY || arch == entry->validArchs)␊ |
| 180 | ␉␉␉{␊ |
| 181 | ␉␉␉␉if(entry->patchRoutine) entry->patchRoutine(kernelData);␊ |
| 182 | ␉␉␉}␊ |
| 183 | ␉␉␉entry = entry->next;␊ |
| 184 | ␉␉}␊ |
| 185 | ␉}␊ |
| 186 | }␊ |
| 187 | ␊ |
| 188 | int determineKernelArchitecture(void* kernelData)␊ |
| 189 | {␉␊ |
| 190 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC)␊ |
| 191 | ␉{␊ |
| 192 | ␉␉return KERNEL_32;␊ |
| 193 | ␉}␊ |
| 194 | ␉if(((struct mach_header*)kernelData)->magic == MH_MAGIC_64)␊ |
| 195 | ␉{␊ |
| 196 | ␉␉return KERNEL_64;␊ |
| 197 | ␉}␊ |
| 198 | ␉else␊ |
| 199 | ␉{␊ |
| 200 | ␉␉return KERNEL_ERR;␊ |
| 201 | ␉}␊ |
| 202 | }␊ |
| 203 | ␊ |
| 204 | ␊ |
| 205 | /**␊ |
| 206 | **␉␉This functions located the requested symbols in the mach-o file.␊ |
| 207 | **␉␉␉as well as determines the start of the __TEXT segment and __TEXT,__text sections␊ |
| 208 | **/␊ |
| 209 | int locate_symbols(void* kernelData)␊ |
| 210 | {␊ |
| 211 | ␉char is64 = 1;␊ |
| 212 | ␉parse_mach(kernelData, NULL, symbol_handler);␊ |
| 213 | ␉//handle_symtable((UInt32)kernelData, symtableData, &symbol_handler, determineKernelArchitecture(kernelData) == KERNEL_64);␊ |
| 214 | ␉return 1 << is64;␊ |
| 215 | }␊ |
| 216 | ␊ |
| 217 | long long symbol_handler(char* symbolName, long long addr, char is64)␊ |
| 218 | {␊ |
| 219 | ␉// Locate the symbol in the list, if it exists, update it's address␊ |
| 220 | ␉kernSymbols_t *symbol = lookup_kernel_symbol(symbolName);␊ |
| 221 | ␉␊ |
| 222 | ␉if(symbol)␊ |
| 223 | ␉{␊ |
| 224 | ␉␉symbol->addr = addr;␊ |
| 225 | ␉}␊ |
| 226 | ␉␊ |
| 227 | ␉return 0xFFFFFFFF; // fixme␊ |
| 228 | }␊ |
| 229 | ␊ |
| 230 | ␊ |
| 231 | /**␊ |
| 232 | ** Locate the fisrt instance of _panic inside of _cpuid_set_info, and either remove it␊ |
| 233 | ** Or replace it so that the cpuid is set to a valid value.␊ |
| 234 | **/␊ |
| 235 | void patch_cpuid_set_info_all(void* kernelData)␊ |
| 236 | {␊ |
| 237 | ␉switch(Platform->CPU.Model)␊ |
| 238 | ␉{␊ |
| 239 | ␉␉case CPUID_MODEL_ATOM:␊ |
| 240 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
| 241 | ␉␉␉{␊ |
| 242 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
| 243 | ␉␉␉}␊ |
| 244 | ␉␉␉else ␊ |
| 245 | ␉␉␉{␊ |
| 246 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, CPUFAMILY_INTEL_PENRYN, CPUID_MODEL_PENRYN); ␊ |
| 247 | ␊ |
| 248 | ␉␉␉}␊ |
| 249 | ␊ |
| 250 | ␉␉␉break;␊ |
| 251 | ␉␉␉␊ |
| 252 | ␉␉default:␊ |
| 253 | ␉␉␉if(determineKernelArchitecture(kernelData) == KERNEL_32)␊ |
| 254 | ␉␉␉{␊ |
| 255 | ␉␉␉␉patch_cpuid_set_info_32(kernelData, 0, 0);␊ |
| 256 | ␉␉␉}␊ |
| 257 | ␉␉␉else␊ |
| 258 | ␉␉␉{␊ |
| 259 | ␉␉␉␉patch_cpuid_set_info_64(kernelData, 0, 0);␊ |
| 260 | ␉␉␉}␊ |
| 261 | ␊ |
| 262 | ␉␉␉break;␊ |
| 263 | ␉}␊ |
| 264 | }␊ |
| 265 | void patch_cpuid_set_info_64(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
| 266 | {␊ |
| 267 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 268 | ␉␊ |
| 269 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
| 270 | ␉␊ |
| 271 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
| 272 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 273 | ␉␊ |
| 274 | ␉␊ |
| 275 | ␉␊ |
| 276 | ␉//UInt32 jumpLocation = 0;␊ |
| 277 | ␉␊ |
| 278 | ␉␊ |
| 279 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 280 | ␉{␊ |
| 281 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
| 282 | ␉␉return;␊ |
| 283 | ␉␉␊ |
| 284 | ␉}␊ |
| 285 | ␉␊ |
| 286 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 287 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
| 288 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 289 | ␉{␊ |
| 290 | ␉␉verbose("Unable to locate _panic\n");␊ |
| 291 | ␉␉return;␊ |
| 292 | ␉}␊ |
| 293 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 294 | ␉␊ |
| 295 | ␉␊ |
| 296 | ␉␊ |
| 297 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
| 298 | ␉while( ␊ |
| 299 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 300 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 301 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 302 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 303 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 304 | ␉␉ )␊ |
| 305 | ␉{␊ |
| 306 | ␉␉patchLocation++;␊ |
| 307 | ␉}␊ |
| 308 | ␉patchLocation--;␊ |
| 309 | ␉␊ |
| 310 | ␉// Remove panic just in ca se␊ |
| 311 | ␉// The panic instruction is exactly 5 bytes long.␊ |
| 312 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 313 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 314 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 315 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 316 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 317 | ␉␊ |
| 318 | ␉␊ |
| 319 | ␉␊ |
| 320 | ␉// Check for a 10.2.0+ kernel␊ |
| 321 | ␉if(bytes[patchLocation - 19] == 0xC7 && bytes[patchLocation - 18] == 0x05)␊ |
| 322 | ␉{␊ |
| 323 | ␉␉␊ |
| 324 | ␉␉UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 17] << 0 |␊ |
| 325 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 16] << 8 |␊ |
| 326 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 15] << 16 |␊ |
| 327 | ␉␉␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 24;␊ |
| 328 | ␉␉␊ |
| 329 | ␉␉// NOTE: may change, determined based on cpuid_info struct␊ |
| 330 | ␉␉UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 310; ␊ |
| 331 | ␉␉␊ |
| 332 | ␉␉␊ |
| 333 | ␉␉//ffffff8000228b3b -> 0x00490e8b␊ |
| 334 | ␉␉//ffffff8000228c28 -> -237 -> 0x490D9E -> -310␊ |
| 335 | ␉␉␊ |
| 336 | ␉␉␊ |
| 337 | ␉␉// The mov is 10 bytes␊ |
| 338 | ␉␉/*␊ |
| 339 | ␉␉ bytes[patchLocation - 19] = 0x90;␉// c7␊ |
| 340 | ␉␉ bytes[patchLocation - 18] = 0x90;␉// 05␊ |
| 341 | ␉␉ bytes[patchLocation - 17] = 0x90;␉// family location␊ |
| 342 | ␉␉ bytes[patchLocation - 16] = 0x90;␉// family location␊ |
| 343 | ␉␉ bytes[patchLocation - 15] = 0x90;␉// family location␊ |
| 344 | ␉␉ bytes[patchLocation - 14] = 0x90;␉// family location␊ |
| 345 | ␉␉ */␊ |
| 346 | ␉␉bytes[patchLocation - 13] = (impersonateFamily & 0x000000FF) >> 0;␊ |
| 347 | ␉␉bytes[patchLocation - 12] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
| 348 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
| 349 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0xFF000000) >> 24;␊ |
| 350 | ␉␉␊ |
| 351 | ␉␉␊ |
| 352 | ␉␉// The lea (%rip),%rip is 7 bytes␊ |
| 353 | ␉␉bytes[patchLocation - 9] = 0xC7;␊ |
| 354 | ␉␉bytes[patchLocation - 8] = 0x05;␊ |
| 355 | ␉␉bytes[patchLocation - 7] = ((cpuid_model_addr -10) & 0x000000FF) >> 0;␉// NOTE: this opcode is relative in 64bit mode, subtract offset␊ |
| 356 | ␉␉bytes[patchLocation - 6] = ((cpuid_model_addr -10) & 0x0000FF00) >> 8;␉␊ |
| 357 | ␉␉bytes[patchLocation - 5] = ((cpuid_model_addr -10) & 0x00FF0000) >> 16;␊ |
| 358 | ␉␉bytes[patchLocation - 4] = ((cpuid_model_addr -10) & 0xFF000000) >> 24;␊ |
| 359 | ␉␉bytes[patchLocation - 3] = impersonateModel;␉// cpuid_model␊ |
| 360 | ␉␉␊ |
| 361 | ␉␉ ␊ |
| 362 | ␉␉ ␊ |
| 363 | ␉␉ // The xor eax eax is 2 bytes␊ |
| 364 | ␉␉bytes[patchLocation - 2] = 0x01;␉// cpuid_extmodel␊ |
| 365 | ␉␉bytes[patchLocation - 1] = 0x00;␉// cpuid_extfamily␊ |
| 366 | ␉␉␊ |
| 367 | ␉␉// The panic instruction is exactly 5 bytes long.␊ |
| 368 | ␉␉bytes[patchLocation - 0] = 0x02;␉// cpuid_stepping␊ |
| 369 | ␉␉/*bytes[patchLocation + 1] = 0x90;␊ |
| 370 | ␉␉bytes[patchLocation + 2] = 0x90;␊ |
| 371 | ␉␉bytes[patchLocation + 3] = 0x90;␊ |
| 372 | ␉␉bytes[patchLocation + 4] = 0x90;␊ |
| 373 | ␉␉*/␊ |
| 374 | ␉␉␊ |
| 375 | ␉␉// Panic call has been removed.␊ |
| 376 | ␉␉// Override the CPUID now. This requires ~ 10 bytes on 10.0.0 kernels␊ |
| 377 | ␉␉// On 10.2.0+ kernels, this requires ~16 bytes␊ |
| 378 | ␉␉␊ |
| 379 | ␉␉// Total: 24 bytes␊ |
| 380 | ␉␉verbose("Running on a 10.2.0+ kernel\n");␊ |
| 381 | ␉␉getc();␊ |
| 382 | ␊ |
| 383 | ␉}␊ |
| 384 | ␉else {␊ |
| 385 | ␉␉verbose("Running on a 10.0.0 kernel, patch unsupported\n");␊ |
| 386 | ␉␉getc();␊ |
| 387 | ␉}␊ |
| 388 | ␊ |
| 389 | ␉␊ |
| 390 | }␊ |
| 391 | ␊ |
| 392 | ␊ |
| 393 | ␊ |
| 394 | ␊ |
| 395 | ␊ |
| 396 | void patch_cpuid_set_info_32(void* kernelData, UInt32 impersonateFamily, UInt8 impersonateModel)␊ |
| 397 | {␊ |
| 398 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 399 | ␉␊ |
| 400 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_cpuid_set_info");␊ |
| 401 | ␊ |
| 402 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; //␉(kernelSymbolAddresses[SYMBOL_CPUID_SET_INFO] - textAddress + textSection);␊ |
| 403 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 404 | ␉UInt32 addrLocation = patchLocation;␊ |
| 405 | ␉␊ |
| 406 | ␊ |
| 407 | ␉UInt32 jumpLocation = 0;␊ |
| 408 | ␉␊ |
| 409 | ␉␊ |
| 410 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 411 | ␉{␊ |
| 412 | ␉␉verbose("Unable to locate _cpuid_set_info\n");␊ |
| 413 | ␉␉return;␊ |
| 414 | ␉␉␊ |
| 415 | ␉}␊ |
| 416 | ␊ |
| 417 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 418 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; //kernelSymbolAddresses[SYMBOL_PANIC] - textAddress;␊ |
| 419 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 420 | ␉{␊ |
| 421 | ␉␉verbose("Unable to locate _panic\n");␊ |
| 422 | ␉␉return;␊ |
| 423 | ␉}␊ |
| 424 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 425 | ␊ |
| 426 | ␉␊ |
| 427 | ␊ |
| 428 | ␉//TODO: don't assume it'll always work (Look for *next* function address in symtab and fail once it's been reached)␊ |
| 429 | ␉while( ␊ |
| 430 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 431 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 432 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 433 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 434 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 435 | ␉␉ )␊ |
| 436 | ␉{␊ |
| 437 | ␉␉patchLocation++;␊ |
| 438 | ␉}␊ |
| 439 | ␉patchLocation--;␊ |
| 440 | ␉␊ |
| 441 | ␉// Remove panic call, just in case the following patch routines fail␊ |
| 442 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 443 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 444 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 445 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 446 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 447 | ␉␊ |
| 448 | ␉␊ |
| 449 | ␉// Locate the jump call, so that 10 bytes can be reclamed.␊ |
| 450 | ␉// NOTE: This will *NOT* be located on pre 10.6.2 kernels␊ |
| 451 | ␉jumpLocation = patchLocation - 15;␊ |
| 452 | ␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
| 453 | ␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation - 18)) &&␊ |
| 454 | ␉␉ (patchLocation - jumpLocation) < 0xF0)␊ |
| 455 | ␉{␊ |
| 456 | ␉␉jumpLocation--;␊ |
| 457 | ␉}␊ |
| 458 | ␉// If found... AND we want to impersonate a specific cpumodel / family...␊ |
| 459 | ␉if(impersonateFamily && impersonateModel &&␊ |
| 460 | ␉ ((patchLocation - jumpLocation) < 0xF0))␊ |
| 461 | ␉{␊ |
| 462 | ␉␉bytes[jumpLocation] -= 10;␉␉// sizeof(movl␉$0x6b5a4cd2,0x00872eb4) = 10bytes␊ |
| 463 | ␉␉␊ |
| 464 | ␉␉/* ␊ |
| 465 | ␉␉ * Inpersonate the specified CPU FAMILY and CPU Model␊ |
| 466 | ␉␉ */␊ |
| 467 | ␉␉//␉␉␉␉␉␉␉␉␉cpuid_cpufamily_addr, impersonateFamily␉␉␉␉␉␉␉␉␉cpuid_model_addr␉ impersonateModel␊ |
| 468 | ␉␉//char new_bytes[] = {0xC7, 0x05, 0x__, 0x__, 0x__, 0x__, 0x__, 0x__, 0x__, 0x__, 0x90, 0x90, 0xC7, 0x05, 0x__, 0x__, 0x__, 0x__, 0x__, 0x01, 0x00, 0x02};␊ |
| 469 | ␉␉// bytes[patchLocation - 17] = 0xC7;␉// already here... not needed to be done␊ |
| 470 | ␉␉// bytes[patchLocation - 16] = 0x05;␉// see above␊ |
| 471 | ␉␉//UInt32 cpuid_cpufamily_addr =␉bytes[patchLocation - 15] << 0 |␊ |
| 472 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 14] << 8 |␊ |
| 473 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 13] << 16 |␊ |
| 474 | ␉␉//␉␉␉␉␉␉␉␉bytes[patchLocation - 12] << 24;␊ |
| 475 | ␉␉␊ |
| 476 | ␉␉// NOTE: may change, determined based on cpuid_info struct: TODO: read from binary␊ |
| 477 | ␉␉//UInt32 cpuid_model_addr = cpuid_cpufamily_addr - 295; ␊ |
| 478 | ␉␉␊ |
| 479 | ␉␉␊ |
| 480 | ␉␉// cpufamily␊ |
| 481 | ␉␉bytes[patchLocation - 11] = (impersonateFamily & 0x000000FF) >> 0;␊ |
| 482 | ␉␉bytes[patchLocation - 10] = (impersonateFamily & 0x0000FF00) >> 8;␊ |
| 483 | ␉␉bytes[patchLocation - 9] = (impersonateFamily & 0x00FF0000) >> 16;␉␊ |
| 484 | ␉␉bytes[patchLocation - 8] = (impersonateFamily & 0xFF000000) >> 24;␊ |
| 485 | ␉␉␊ |
| 486 | ␉␉// NOPS, just in case if the jmp call wasn't patched, we'll jump to a␊ |
| 487 | ␉␉// nop and continue with the rest of the patch␊ |
| 488 | ␉␉// Yay two free bytes :), 10 more can be reclamed if needed, as well as a few␊ |
| 489 | ␉␉// from the above code (only cpuid_model needs to be set.␊ |
| 490 | ␉␉bytes[patchLocation - 7] = 0x90;␊ |
| 491 | ␉␉bytes[patchLocation - 6] = 0x90;␊ |
| 492 | ␉␉␊ |
| 493 | ␉␉bytes[patchLocation - 5] = 0xC7;␊ |
| 494 | ␉␉bytes[patchLocation - 4] = 0x05;␊ |
| 495 | ␉␉␊ |
| 496 | ␉␉// Locate cpuid_addr_addr -> first four bytes after 8b 45 d8 25 f0 00 00 00 c1 e8 04 a2␊ |
| 497 | ␉␉while(bytes[addrLocation -12] != 0x8B ||␊ |
| 498 | ␉␉␉ bytes[addrLocation -11] != 0x45 ||␊ |
| 499 | ␉␉␉ bytes[addrLocation -10] != 0xD8 ||␊ |
| 500 | ␉␉␉ bytes[addrLocation -9] != 0x25 ||␊ |
| 501 | ␉␉␉ bytes[addrLocation -8] != 0xF0 ||␊ |
| 502 | ␉␉␉ bytes[addrLocation -7] != 0x00 ||␊ |
| 503 | ␉␉␉ bytes[addrLocation -6] != 0x00 ||␊ |
| 504 | ␉␉␉ bytes[addrLocation -5] != 0x00 ||␊ |
| 505 | ␉␉␉ bytes[addrLocation -4] != 0xC1 ||␊ |
| 506 | ␉␉␉ bytes[addrLocation -3] != 0xE8 ||␊ |
| 507 | ␉␉␉ bytes[addrLocation -2] != 0x04 ||␊ |
| 508 | ␉␉␉ bytes[addrLocation -1] != 0xA2)␊ |
| 509 | ␉␉{␊ |
| 510 | ␉␉␉// TODO: break if location is too large␊ |
| 511 | ␉␉␉addrLocation++;␊ |
| 512 | ␉␉}␉␉␊ |
| 513 | ␉␉␊ |
| 514 | ␉␉bytes[patchLocation - 3] = bytes[addrLocation];␊ |
| 515 | ␉␉bytes[patchLocation - 2] = bytes[addrLocation+1];␉␊ |
| 516 | ␉␉bytes[patchLocation - 1] = bytes[addrLocation+2];␊ |
| 517 | ␉␉bytes[patchLocation - 0] = bytes[addrLocation+3];␊ |
| 518 | ␉␉␊ |
| 519 | ␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
| 520 | ␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
| 521 | ␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
| 522 | ␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
| 523 | ␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
| 524 | ␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␉␉␊ |
| 525 | ␉}␊ |
| 526 | ␉else if(impersonateFamily && impersonateModel)␊ |
| 527 | ␉{␊ |
| 528 | ␊ |
| 529 | ␉␉// pre 10.6.2 kernel␊ |
| 530 | ␉␉// Locate the jump to directly *after* the panic call,␊ |
| 531 | ␉␉jumpLocation = patchLocation - 4;␊ |
| 532 | ␉␉while((bytes[jumpLocation - 1] != 0x77 ||␊ |
| 533 | ␉␉␉ bytes[jumpLocation] != (patchLocation - jumpLocation + 4)) &&␊ |
| 534 | ␉␉␉ (patchLocation - jumpLocation) < 0x20)␊ |
| 535 | ␉␉{␊ |
| 536 | ␉␉␉jumpLocation--;␊ |
| 537 | ␉␉}␊ |
| 538 | ␉␉// NOTE above isn't needed (I was going to use it, but I'm not, so instead,␊ |
| 539 | ␉␉// I'll just leave it to verify the binary stucture.␊ |
| 540 | ␉␉␊ |
| 541 | ␉␉// NOTE: the cpumodel_familt data is not set in _cpuid_set_info␊ |
| 542 | ␉␉// so we don't need to set it here, I'll get set later based on the model␊ |
| 543 | ␉␉// we set now.␊ |
| 544 | ␉␉␊ |
| 545 | ␉␉if((patchLocation - jumpLocation) < 0x20)␊ |
| 546 | ␉␉{␊ |
| 547 | ␉␉␉UInt32 cpuid_model_addr =␉(bytes[patchLocation - 14] << 0 |␊ |
| 548 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 13] << 8 |␊ |
| 549 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 12] << 16 |␊ |
| 550 | ␉␉␉␉␉␉␉␉␉␉ bytes[patchLocation - 11] << 24);␊ |
| 551 | ␉␉␉// Remove jump␊ |
| 552 | ␉␉␉bytes[patchLocation - 9] = 0x90;␉␉/// Was a jump if supported cpu␊ |
| 553 | ␉␉␉bytes[patchLocation - 8] = 0x90;␉␉// jumped past the panic call, we want to override the panic␊ |
| 554 | ␉␉␉␊ |
| 555 | ␉␉␉bytes[patchLocation - 7] = 0x90;␊ |
| 556 | ␉␉␉bytes[patchLocation - 6] = 0x90;␊ |
| 557 | ␉␉␉␊ |
| 558 | ␉␉␉bytes[patchLocation - 5] = 0xC7;␊ |
| 559 | ␉␉␉bytes[patchLocation - 4] = 0x05;␊ |
| 560 | ␉␉␉bytes[patchLocation - 3] = (cpuid_model_addr & 0x000000FF) >> 0;␊ |
| 561 | ␉␉␉bytes[patchLocation - 2] = (cpuid_model_addr & 0x0000FF00) >> 8;␉␊ |
| 562 | ␉␉␉bytes[patchLocation - 1] = (cpuid_model_addr & 0x00FF0000) >> 16;␊ |
| 563 | ␉␉␉bytes[patchLocation - 0] = (cpuid_model_addr & 0xFF000000) >> 24;␊ |
| 564 | ␉␉␉␊ |
| 565 | ␉␉␉// Note: I could have just copied the 8bit cpuid_model in and saved about 4 bytes␊ |
| 566 | ␉␉␉// so if this function need a different patch it's still possible. Also, about ten bytes previous can be freed.␊ |
| 567 | ␉␉␉bytes[patchLocation + 1] = impersonateModel;␉// cpuid_model␊ |
| 568 | ␉␉␉bytes[patchLocation + 2] = 0x01;␉// cpuid_extmodel␊ |
| 569 | ␉␉␉bytes[patchLocation + 3] = 0x00;␉// cpuid_extfamily␊ |
| 570 | ␉␉␉bytes[patchLocation + 4] = 0x02;␉// cpuid_stepping␊ |
| 571 | ␉␉␉␊ |
| 572 | ␉␉␉␊ |
| 573 | ␉␉␉␊ |
| 574 | ␉␉␉//patchLocation = jumpLocation;␊ |
| 575 | ␉␉␉// We now have 14 bytes available for a patch␊ |
| 576 | ␊ |
| 577 | ␉␉}␊ |
| 578 | ␉␉else ␊ |
| 579 | ␉␉{␊ |
| 580 | ␉␉␉// Patching failed, using NOP replacement done initialy␊ |
| 581 | ␉␉}␊ |
| 582 | ␉}␊ |
| 583 | ␉else ␊ |
| 584 | ␉{␊ |
| 585 | ␉␉// Either We were unable to change the jump call due to the function's sctructure␊ |
| 586 | ␉␉// changing, or the user did not request a patch. As such, resort to just ␊ |
| 587 | ␉␉// removing the panic call (using NOP replacement above). Note that the␊ |
| 588 | ␉␉// IntelCPUPM kext may still panic due to the cpu's Model ID not being patched␊ |
| 589 | ␉}␊ |
| 590 | }␊ |
| 591 | ␊ |
| 592 | ␊ |
| 593 | /**␊ |
| 594 | ** SleepEnabler.kext replacement (for those that need it)␊ |
| 595 | ** Located the KERN_INVALID_ARGUMENT return and replace it with KERN_SUCCESS␊ |
| 596 | **/␊ |
| 597 | void patch_pmCPUExitHaltToOff(void* kernelData)␊ |
| 598 | {␊ |
| 599 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 600 | ␊ |
| 601 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_PmCpuExitHaltToOff");␊ |
| 602 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0;␊ |
| 603 | ␉␊ |
| 604 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 605 | ␉{␊ |
| 606 | ␉␉verbose("Unable to locate _pmCPUExitHaltToOff\n");␊ |
| 607 | ␉␉return;␊ |
| 608 | ␉}␊ |
| 609 | ␉␊ |
| 610 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 611 | ␉␊ |
| 612 | ␉␊ |
| 613 | ␉␊ |
| 614 | ␉while(bytes[patchLocation - 1]␉!= 0xB8 ||␊ |
| 615 | ␉␉ bytes[patchLocation]␉␉!= 0x04 ||␉// KERN_INVALID_ARGUMENT (0x00000004)␊ |
| 616 | ␉␉ bytes[patchLocation + 1]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
| 617 | ␉␉ bytes[patchLocation + 2]␉!= 0x00 ||␉// KERN_INVALID_ARGUMENT␊ |
| 618 | ␉␉ bytes[patchLocation + 3]␉!= 0x00)␉// KERN_INVALID_ARGUMENT␊ |
| 619 | ␊ |
| 620 | ␉{␊ |
| 621 | ␉␉patchLocation++;␊ |
| 622 | ␉}␊ |
| 623 | ␉bytes[patchLocation] = 0x00;␉// KERN_SUCCESS;␊ |
| 624 | }␊ |
| 625 | ␊ |
| 626 | void patch_lapic_init(void* kernelData)␊ |
| 627 | {␊ |
| 628 | ␉UInt8 panicIndex = 0;␊ |
| 629 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 630 | ␉␊ |
| 631 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_init");␊ |
| 632 | ␉UInt32 patchLocation = symbol ? symbol->addr - textAddress + textSection: 0; ␊ |
| 633 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 634 | ␉{␊ |
| 635 | ␉␉verbose("Unable to locate %s\n", "_lapic_init");␊ |
| 636 | ␉␉return;␊ |
| 637 | ␉␉␊ |
| 638 | ␉}␊ |
| 639 | ␉␊ |
| 640 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 641 | ␉UInt32 panicAddr = symbol ? symbol->addr - textAddress: 0; ␊ |
| 642 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 643 | ␉{␊ |
| 644 | ␉␉verbose("Unable to locate %s\n", "_panic");␊ |
| 645 | ␉␉return;␊ |
| 646 | ␉}␊ |
| 647 | ␉␊ |
| 648 | ␉patchLocation -= (UInt32)kernelData;␉// Remove offset␊ |
| 649 | ␉panicAddr -= (UInt32)kernelData;␉// Remove offset␊ |
| 650 | ␊ |
| 651 | ␉␊ |
| 652 | ␉␊ |
| 653 | ␉␊ |
| 654 | ␉// Locate the (panicIndex + 1) panic call␊ |
| 655 | ␉while(panicIndex < 3)␉// Find the third panic call␊ |
| 656 | ␉{␊ |
| 657 | ␉␉while( ␊ |
| 658 | ␉␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 659 | ␉␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 660 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 661 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 662 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 663 | ␉␉␉ )␊ |
| 664 | ␉␉{␊ |
| 665 | ␉␉␉patchLocation++;␊ |
| 666 | ␉␉}␊ |
| 667 | ␉␉patchLocation++;␊ |
| 668 | ␉␉panicIndex++;␊ |
| 669 | ␉}␊ |
| 670 | ␉patchLocation--;␉// Remove extra increment from the < 3 while loop␊ |
| 671 | ␉␊ |
| 672 | ␉bytes[--patchLocation] = 0x90;␉␊ |
| 673 | ␉bytes[++patchLocation] = 0x90;␊ |
| 674 | ␉bytes[++patchLocation] = 0x90;␊ |
| 675 | ␉bytes[++patchLocation] = 0x90;␊ |
| 676 | ␉bytes[++patchLocation] = 0x90;␊ |
| 677 | ␉␊ |
| 678 | ␉␊ |
| 679 | }␊ |
| 680 | ␊ |
| 681 | ␊ |
| 682 | void patch_commpage_stuff_routine(void* kernelData)␊ |
| 683 | {␊ |
| 684 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 685 | ␊ |
| 686 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_commpage_stuff_routine");␊ |
| 687 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 688 | ␉{␊ |
| 689 | ␉␉//printf("Unable to locate %s\n", "_commpage_stuff_routine");␊ |
| 690 | ␉␉return;␊ |
| 691 | ␉␉␊ |
| 692 | ␉}␊ |
| 693 | ␉␊ |
| 694 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 695 | ␊ |
| 696 | ␉␊ |
| 697 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 698 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 699 | ␉{␊ |
| 700 | ␉␉verbose("Unable to locate %s\n", "_panic");␊ |
| 701 | ␉␉return;␊ |
| 702 | ␉}␊ |
| 703 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
| 704 | ␊ |
| 705 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 706 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 707 | ␉␊ |
| 708 | ␉while( ␊ |
| 709 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 710 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 711 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 712 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 713 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 714 | ␉␉ )␊ |
| 715 | ␉{␊ |
| 716 | ␉␉patchLocation++;␊ |
| 717 | ␉}␊ |
| 718 | ␉patchLocation--;␊ |
| 719 | ␉␊ |
| 720 | ␉// Replace panic with nops␊ |
| 721 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 722 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 723 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 724 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 725 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 726 | ␉␊ |
| 727 | ␉␊ |
| 728 | }␊ |
| 729 | ␊ |
| 730 | void patch_lapic_interrupt(void* kernelData)␊ |
| 731 | {␊ |
| 732 | ␉// NOTE: this is a hack untill I finish patch_lapic_configure␊ |
| 733 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 734 | ␉␊ |
| 735 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_interrupt");␊ |
| 736 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 737 | ␉{␊ |
| 738 | ␉␉verbose("Unable to locate %s\n", "_lapic_interrupt");␊ |
| 739 | ␉␉return;␊ |
| 740 | ␉␉␊ |
| 741 | ␉}␊ |
| 742 | ␉␊ |
| 743 | ␉UInt32 patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 744 | ␉␊ |
| 745 | ␉␊ |
| 746 | ␉symbol = lookup_kernel_symbol("_panic");␊ |
| 747 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 748 | ␉{␊ |
| 749 | ␉␉verbose("Unable to locate %s\n", "_panic");␊ |
| 750 | ␉␉return;␊ |
| 751 | ␉}␊ |
| 752 | ␉UInt32 panicAddr = symbol->addr - textAddress; ␊ |
| 753 | ␉␊ |
| 754 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 755 | ␉panicAddr -= (UInt32)kernelData;␊ |
| 756 | ␉␊ |
| 757 | ␉while( ␊ |
| 758 | ␉␉ (bytes[patchLocation -1] != 0xE8) ||␊ |
| 759 | ␉␉ ( ( (UInt32)(panicAddr - patchLocation - 4) + textSection ) != (UInt32)((bytes[patchLocation + 0] << 0 | ␊ |
| 760 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 1] << 8 | ␊ |
| 761 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 2] << 16 |␊ |
| 762 | ␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉␉bytes[patchLocation + 3] << 24)))␊ |
| 763 | ␉␉ )␊ |
| 764 | ␉{␊ |
| 765 | ␉␉patchLocation++;␊ |
| 766 | ␉}␊ |
| 767 | ␉patchLocation--;␊ |
| 768 | ␉␊ |
| 769 | ␉// Replace panic with nops␊ |
| 770 | ␉bytes[patchLocation + 0] = 0x90;␊ |
| 771 | ␉bytes[patchLocation + 1] = 0x90;␊ |
| 772 | ␉bytes[patchLocation + 2] = 0x90;␊ |
| 773 | ␉bytes[patchLocation + 3] = 0x90;␊ |
| 774 | ␉bytes[patchLocation + 4] = 0x90;␊ |
| 775 | ␉␊ |
| 776 | ␉␊ |
| 777 | }␊ |
| 778 | ␊ |
| 779 | ␊ |
| 780 | void patch_lapic_configure(void* kernelData)␊ |
| 781 | {␊ |
| 782 | ␉UInt8* bytes = (UInt8*)kernelData;␊ |
| 783 | ␉␊ |
| 784 | ␉UInt32 patchLocation;␊ |
| 785 | ␉UInt32 lapicStart;␊ |
| 786 | ␉UInt32 lapicInterruptBase;␊ |
| 787 | ␉␊ |
| 788 | ␉kernSymbols_t *symbol = lookup_kernel_symbol("_lapic_configure");␊ |
| 789 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 790 | ␉{␊ |
| 791 | ␉␉verbose("Unable to locate %s\n", "_lapic_configure");␊ |
| 792 | ␉␉return;␊ |
| 793 | ␉}␊ |
| 794 | ␉patchLocation = symbol->addr - textAddress + textSection; ␊ |
| 795 | ␉␊ |
| 796 | ␉symbol = lookup_kernel_symbol("_lapic_start");␊ |
| 797 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 798 | ␉{␊ |
| 799 | ␉␉verbose("Unable to locate %s\n", "_lapic_start");␊ |
| 800 | ␉␉return;␊ |
| 801 | ␉}␊ |
| 802 | ␉lapicStart = symbol->addr; ␊ |
| 803 | ␊ |
| 804 | ␊ |
| 805 | ␉symbol = lookup_kernel_symbol("_lapic_interrupt_base");␊ |
| 806 | ␉if(symbol == 0 || symbol->addr == 0)␊ |
| 807 | ␉{␊ |
| 808 | ␉␉verbose("Unable to locate %s\n", "_lapic_interrupt_base");␊ |
| 809 | ␉␉return;␊ |
| 810 | ␉}␊ |
| 811 | ␉lapicInterruptBase = symbol->addr;␊ |
| 812 | ␉patchLocation -= (UInt32)kernelData;␊ |
| 813 | ␉lapicStart -= (UInt32)kernelData;␊ |
| 814 | ␉lapicInterruptBase -= (UInt32)kernelData;␊ |
| 815 | ␉␊ |
| 816 | ␉␊ |
| 817 | ␉// Looking for the following:␊ |
| 818 | ␉//movl _lapic_start,%e_x␊ |
| 819 | ␉//addl $0x00000320,%e_x␊ |
| 820 | ␉// 8b 15 __ __ __ __ 81 c2 20 03 00 00␊ |
| 821 | ␉while( ␊ |
| 822 | ␉␉ (bytes[patchLocation - 2] != 0x8b) ||␊ |
| 823 | ␉␉ //bytes[patchLocation -1] != 0x15) ||␉// Register, we don't care what it is␊ |
| 824 | ␉␉ ( lapicStart != (UInt32)(␊ |
| 825 | ␉␉␉␉␉␉␉␉␉(bytes[patchLocation + 0] << 0 | ␊ |
| 826 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 1] << 8 | ␊ |
| 827 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 2] << 16 |␊ |
| 828 | ␉␉␉␉␉␉␉␉␉ bytes[patchLocation + 3] << 24␊ |
| 829 | ␉␉␉␉␉␉␉␉␉)␊ |
| 830 | ␉␉␉␉␉␉␉␉ )␊ |
| 831 | ␉␉ ) || ␊ |
| 832 | ␉␉ (bytes[patchLocation + 4 ] != 0x81) ||␊ |
| 833 | ␉␉ //(bytes[patchLocation + 5 ] != 0Cx2) ||␉// register␊ |
| 834 | ␉␉ (bytes[patchLocation + 6 ] != 0x20) ||␊ |
| 835 | ␉␉ (bytes[patchLocation + 7 ] != 0x03) ||␊ |
| 836 | ␉␉ (bytes[patchLocation + 8 ] != 0x00) ||␊ |
| 837 | ␉␉ (bytes[patchLocation + 9] != 0x00)␊ |
| 838 | ␊ |
| 839 | ␉␉ )␊ |
| 840 | ␉{␊ |
| 841 | ␉␉patchLocation++;␊ |
| 842 | ␉}␊ |
| 843 | ␉patchLocation-=2;␊ |
| 844 | ␊ |
| 845 | ␉// NOTE: this is currently hardcoded, change it to be more resilient to changes␊ |
| 846 | ␉// At a minimum, I should have this do a cheksup first and if not matching, remove the panic instead.␊ |
| 847 | ␉␊ |
| 848 | ␉// 8b 15 __ __ __ __ -> movl␉␉ _lapic_start,%edx (NOTE: this should already be here)␊ |
| 849 | ␉/*␊ |
| 850 | ␉bytes[patchLocation++] = 0x8B;␊ |
| 851 | ␉bytes[patchLocation++] = 0x15;␊ |
| 852 | ␉bytes[patchLocation++] = (lapicStart & 0x000000FF) >> 0;␊ |
| 853 | ␉bytes[patchLocation++] = (lapicStart & 0x0000FF00) >> 8;␊ |
| 854 | ␉bytes[patchLocation++] = (lapicStart & 0x00FF0000) >> 16;␊ |
| 855 | ␉bytes[patchLocation++] = (lapicStart & 0xFF000000) >> 24;␊ |
| 856 | ␉*/␊ |
| 857 | ␉patchLocation += 6;␊ |
| 858 | ␉␊ |
| 859 | ␉// 81 c2 60 03 00 00 -> addl␉␉ $0x00000320,%edx␊ |
| 860 | ␉/*␊ |
| 861 | ␉bytes[patchLocation++] = 0x81;␊ |
| 862 | ␉bytes[patchLocation++] = 0xC2;␊ |
| 863 | ␉*/␊ |
| 864 | ␉patchLocation += 2;␊ |
| 865 | ␉bytes[patchLocation++] = 0x60;␊ |
| 866 | ␉/*␊ |
| 867 | ␉bytes[patchLocation++];// = 0x03;␊ |
| 868 | ␉bytes[patchLocation++];// = 0x00;␊ |
| 869 | ␉bytes[patchLocation++];// = 0x00;␊ |
| 870 | ␉*/␊ |
| 871 | ␉ patchLocation += 3;␊ |
| 872 | ␊ |
| 873 | ␉// c7 02 00 04 00 00 -> movl␉␉ $0x00000400,(%edx)␊ |
| 874 | ␉bytes[patchLocation++] = 0xC7;␊ |
| 875 | ␉bytes[patchLocation++] = 0x02;␊ |
| 876 | ␉bytes[patchLocation++] = 0x00;␊ |
| 877 | ␉bytes[patchLocation++] = 0x04;␊ |
| 878 | ␉bytes[patchLocation++] = 0x00;␊ |
| 879 | ␉bytes[patchLocation++] = 0x00;␊ |
| 880 | ␉␊ |
| 881 | ␉// 83 ea 40 -> subl␉␉ $0x40,edx␊ |
| 882 | ␉bytes[patchLocation++] = 0x83;␊ |
| 883 | ␉bytes[patchLocation++] = 0xEA;␊ |
| 884 | ␉bytes[patchLocation++] = 0x40;␊ |
| 885 | ␊ |
| 886 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 887 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 888 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 889 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 890 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 891 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 892 | ␊ |
| 893 | ␉// 83 c0 0e -> addl␉␉ $0x0e,%eax␊ |
| 894 | ␉bytes[patchLocation++] = 0x83;␊ |
| 895 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 896 | ␉bytes[patchLocation++] = 0x0E;␊ |
| 897 | ␊ |
| 898 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 899 | ␉bytes[patchLocation++] = 0x89;␊ |
| 900 | ␉bytes[patchLocation++] = 0x02;␊ |
| 901 | ␉␊ |
| 902 | ␉// 81c230030000␉␉ addl␉␉ $0x00000330,%edx␊ |
| 903 | ␉bytes[patchLocation++] = 0x81;␊ |
| 904 | ␉bytes[patchLocation++] = 0xC2;␊ |
| 905 | ␉bytes[patchLocation++] = 0x30;␊ |
| 906 | ␉bytes[patchLocation++] = 0x03;␊ |
| 907 | ␉bytes[patchLocation++] = 0x00;␊ |
| 908 | ␉bytes[patchLocation++] = 0x00;␊ |
| 909 | ␉␊ |
| 910 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 911 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 912 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 913 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 914 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 915 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 916 | ␉␊ |
| 917 | ␉// 83 c0 0f -> addl␉␉ $0x0f,%eax␊ |
| 918 | ␉bytes[patchLocation++] = 0x83;␊ |
| 919 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 920 | ␉bytes[patchLocation++] = 0x0F;␊ |
| 921 | ␉␊ |
| 922 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 923 | ␉bytes[patchLocation++] = 0x89;␊ |
| 924 | ␉bytes[patchLocation++] = 0x02;␊ |
| 925 | ␉␊ |
| 926 | ␉// 83 ea 10 -> subl␉␉ $0x10,edx␊ |
| 927 | ␉bytes[patchLocation++] = 0x83;␊ |
| 928 | ␉bytes[patchLocation++] = 0xEA;␊ |
| 929 | ␉bytes[patchLocation++] = 0x10;␊ |
| 930 | ␊ |
| 931 | ␉// a1 __ __ __ __ -> movl␉␉ _lapic_interrupt_base,%eax␊ |
| 932 | ␉bytes[patchLocation++] = 0xA1;␊ |
| 933 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x000000FF) >> 0;␊ |
| 934 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x0000FF00) >> 8;␊ |
| 935 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0x00FF0000) >> 16;␊ |
| 936 | ␉bytes[patchLocation++] = (lapicInterruptBase & 0xFF000000) >> 24;␊ |
| 937 | ␉␊ |
| 938 | ␉// 83 c0 0c -> addl␉␉ $0x0c,%eax␊ |
| 939 | ␉bytes[patchLocation++] = 0x83;␊ |
| 940 | ␉bytes[patchLocation++] = 0xC0;␊ |
| 941 | ␉bytes[patchLocation++] = 0x0C;␊ |
| 942 | ␊ |
| 943 | ␉// 89 02 -> movl␉␉ %eax,(%edx)␊ |
| 944 | ␉bytes[patchLocation++] = 0x89;␊ |
| 945 | ␉bytes[patchLocation++] = 0x02;␊ |
| 946 | ␊ |
| 947 | ␉// Replace remaining with nops␊ |
| 948 | ␊ |
| 949 | ␊ |
| 950 | ␉bytes[patchLocation++] = 0x90;␊ |
| 951 | ␉bytes[patchLocation++] = 0x90;␊ |
| 952 | ␉bytes[patchLocation++] = 0x90;␊ |
| 953 | ␉bytes[patchLocation++] = 0x90;␊ |
| 954 | ␉//␉bytes[patchLocation++] = 0x90; // double check the lenght of the patch...␊ |
| 955 | ␉//␉bytes[patchLocation++] = 0x90;␊ |
| 956 | }␊ |
| 957 | |
